Puppy biting clothes

Morning!DPup has started biting and tugging our clothes a lot yesterday and today. I've been putting him in time-out in his playpen, and playing with him out of it as much as I can, but is there anything else I can try to curb it?

Just stand perfectly still with your arms across your body. They'll get bored and stop. If you respond by grabbing a toy you're giving him attention for it and it'll become a way of asking to play. I wouldn't worry though, they all grow out of it.

I'd probably put him in another room rather than his playpen in case he starts to have negative associations with it, assuming it's his 'safe space'. Time out is the correct way to deal with this behaviour though. Alternatively you could put a long training lead on him and stand on it every time he does this.